Thu Oct 27, 2016 8:51 am by cornbinder89
A goggle search for "Delco DN 10 wireing" will bring up a wiring diagram. For both alternators and generators there are only 2 regulators circuits. One regulated the field on the "ground side" of the field, that is to say the field is always connected to the "hot" output and the ground end is controlled by the regulator. The other way is to have one end of the field connected to ground and the regulator controls the "hot" side.
Every mfg has a different set-up but they are all one of these two types.
Does the truck in question have a "charge light" or an ammeter (or both)? It will effect how the wiring is done.
The simiplest regulator requires only a "hot" a "field" and a "ground" connection to control an Alternator. You can even use a generator regulator to control an alternator (but not the other way around)
The Delco DN 10 regulator also has a relay in it. The relay can be used to switch the regulator on and provide field current, but is not required. When used with a "charge light" the A/C voltage (well to be more correct 1/2 wave DC current) is used to close the field relay and turn on the field current when the alternator is spinning fast enough. Before that happens the current in the field comes through the charge light (lighting it) and provides a weak field current to "get things started". If the truck doesn't use a charge light, the field may still be controlled by the field relay, but it is not required to do so. Useing the field relay allows for a connection to the system voltage that doesn't go thru the ign switch and related wireing, so less chance of a voltage drop effecting the voltage the regulator "sees" and uses to set system voltage.
In the simplest form all you need to control a DN 10 is a swtiched ign feed to the regulator, (so the field will not stay energized with the key off) a wire to the field connection on the alternator from the regulator and a good ground. The early Chry regulator works exactly like that, and has only those 3 connections.